DESTDIR ?=
MAVEN_LOCAL_REPO ?= ~/.m2

ANT = ant
EXISTS = test -e
FIND = find
INSTALL = install
RM = rm -f
TOUCH = touch
XMLSTARLET = xml

artifactId  := $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:artifactId -n pom.xml)
version     := $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:version    -n pom.xml)
groupId     := $(shell $(XMLSTARLET) sel -T -t -c /_:project/_:groupId    -n pom.xml)

all: PHONY javassist.jar

javassist.jar: $(shell $(FIND) src/main) build.xml
	$(ANT) jar
	$(EXISTS) '$@'
	$(TOUCH) '$@'

install-base = $(DESTDIR)$(MAVEN_LOCAL_REPO)/$(subst .,/,$(groupId))/$(artifactId)/$(version)/$(artifactId)-$(version)
install: PHONY $(install-base).jar $(install-base).pom

$(install-base).jar: javassist.jar
	$(INSTALL) -Dm644 $< $@
$(install-base).pom: pom.xml
	$(INSTALL) -Dm644 $< $@

clean: PHONY
	$(RM) -r target javassist.jar

.PHONY: PHONY
.DELETE_ON_ERROR:
.SECONDARY: